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x86 jmp opcode
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jump instruction in assembly language
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This section should not be considered an exhaustive list of x86 instructions, but rather a useful subset. For a complete list, see . jmp — Jump. Transfers program control flow to the instruction at the memory location indicated by the operand. Syntax jmp <label>. Example jmp begin — Jump to the
In the x86 assembly language, the JMP instruction performs an unconditional jump. Such an instruction transfers the flow of execution by changing the instruction pointer register. There are a number of different opcodes that perform a jump; depending on whether the processor is in real mode or protected mode, and an
The jump instructions allow the programmer to (indirectly) set the value of the EIP register. The location passed as the argument is usually a label. The first instruction executed after the jump is the instruction immediately following the label. All of the jump instructions, with the exception of
A task switch can only be executed in protected mode (see Chapter 6, Task Management, in the IA-32 Intel Architecture Software Developer's Manual, Volume 3, for information on performing task switches with the JMP instruction). Near and Short Jumps. When executing a near jump, the processor jumps to the address
14 Oct 2004 Here we discuss the use of two-byte JMP instructions in x86 Assembly code. Though we mention only JMP code, what you'll learn here about Relative offsets will also apply to all Conditional Jumps (such as JE, JG, JC, JZ, JNE, JNG, JNC, JNZ, etc.) as well! These are also known as SHORT Relative Jumps.
x86 Assembly. Chapter 4-5, Irvine. Jump Instruction. • The JMP instruction tells the CPU to “Jump" to a new location. This is essentially a goto statement. We should load a new IP and possibly a new CS and then start executing code at the new location. • Basic format: Label1: inc ax do processing jmp Label1. This is an
JL/JNGE - Jump Less / Jump Not Greater or Equal; JLE/JNG - Jump Less or Equal / Jump Not Greater; JMP - Unconditional Jump; JNC - Jump Not Carry; JNE/JNZ - Jump Not Equal / Jump Not Zero; JNO - Jump Not Overflow mnemonics; Instruction syntax; op: Instruction OpCode; xx: Additional Code bytes; s: Sign Bit.
Opcode, Instruction, Clocks, Description, Example. EB cb, jmp rel8, 7+m, Jump short, jmp rel8_33. E9 cw, jmp rel16, 7+m, Jump near, displacement relative to next instruction, jmp rel16. FF /4, jmpw r/m16, 7+m/10+m, Jump near indirect, jmpw *%cx jmpw *(%ebx,1) jmpw (%ebx,2) jmpw (%ebx,%ebp,1). EA cd, jmpw ptr16:16
The rel8 is relative to the next instruction's memory address, as can easily be confirmed by creating two executables and disassembling them: @label: jmp @label nop. This disassembles as (with ndisasm, it's the same in 16-bit, 32-bit and 64-bit code): EBFE jmp short 0x0 90 nop. Then, another executable:
Getting the sense for jumps and flags has long been a troublesome area for me, especially since the Intel assembler book shows 32 of these, all with similar-sounding names. Looking more closely I found that many of the instructions were synonyms for each other, and in practice the whole gamut is not needed, and in the
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